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Long-term Debt - Maturities Of Future Principal Obligations Of Long-term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
2021 $ 553  
2022 1,625  
2023 1,291  
2024 1,304  
Thereafter 439  
Total debt $ 5,212 $ 0